|Publication number||US7189223 B2|
|Application number||US 10/757,763|
|Publication date||Mar 13, 2007|
|Filing date||Jan 14, 2004|
|Priority date||Jun 19, 2002|
|Also published as||US6736812, US20030236519, US20040147923, WO2004000106A1|
|Publication number||10757763, 757763, US 7189223 B2, US 7189223B2, US-B2-7189223, US7189223 B2, US7189223B2|
|Inventors||Jason W. Kear|
|Original Assignee||Scimed Life Systems, Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (11), Non-Patent Citations (1), Referenced by (4), Classifications (20), Legal Events (3)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This application is a continuation of U.S. application Ser. No. 10/175,673, filed Jun. 19, 2002 now U.S. Pat. No. 6,736,812.
The present invention relates to medical devices in general and in particular to advancers and retractors to be used with endoscopes.
In many surgical situations, physicians prefer to use tools that allow them to perform multiple tasks with minimal movement. Such tools can be not only less expensive than requiring the purchase of multiple tools that perform a single task but can be more efficient during use.
One situation where efficiency is required is during an endoscopic examination and tissue removal procedure. To remove tissue such as a polyp or other area of interest, a physician typically views the tissue in question with an endoscope. A catheter having a long needle is passed down a lumen in the endoscope and a liquid, such as saline, is injected under the tissue in question in order to raise it from the surrounding tissue. The needle and catheter are then withdrawn from the endoscope and a cauterizing catheter having a wire snare is inserted through the endoscope to remove and cauterize the tissue.
While this method can work well, two catheters are always required and it takes time for the physician to withdraw the first and insert the second. Therefore, there is a need for a device that allows a physician to manipulate two medical devices in a single catheter.
A dual advancer/retractor in accordance with the present invention includes a handle body and a pair of independently moveable finger rings. Each finger ring is adapted to advance or retract a medical device. In one embodiment of the invention, each medical device has an end secured to the handle body and a length which forms a loop within the finger rings such that movement of the finger rings causes an amplified movement of the medical device into and out of a catheter.
The foregoing aspects and many of the attendant advantages of this invention will become more readily appreciated as the same become better understood by reference to the following detailed description, when taken in conjunction with the accompanying drawings, wherein:
During a surgical procedure to remove certain types of tissue, the physician advances the needle 16 out of the catheter and into a tissue area in order to inject a liquid underneath the tissue. The needle 16 is then withdrawn into the catheter 14 and the snare 18 is then advanced out of the catheter and looped over the raised tissue. The snare is then tightened around the base of the tissue and an electrical current is applied to the snare to remove the tissue and cauterize the removal site. As will be explained in further detail below, the present invention allows a physician to independently advance or retract the needle 16 and snare 18 from the catheter with a single handheld advancer/retractor.
A connector 36 is positioned at the distal tip of the body 22 to allow the advancer/retractor 20 to be coupled to a catheter (not shown) by a friction fit or other securing mechanism such as a lever lock. A lock 38 is positioned near the proximal end of the body 22 to allow a user to lock either of the finger rings 30, 32, such that it cannot be advanced or retracted in the channel. When one finger ring is secured with the lock, the other finger ring is preferably free to move. However, the lock may be designed to secure the position of both finger rings at once.
To keep the finger rings in the channel, the advancer/retractor 20 includes at least one rod 48 that is associated with the finger ring 32 and at least one rod 50 that is associated with the finger ring 30. Each rod has an end that is secured to the distal end 40 of the body 22 and a free end that extends into the channel. The rods 48, 50 act as guide rails over which the finger rings 30, 32 slide, in order to keep the finger rings in the channel.
Each of the finger rings 30, 32, is formed of a top and bottom half that are ultrasonically welded together or secured by an adhesive or the like. The finger ring 32 includes a generally straight section 32 a in which the rod 48 is received and a flared proximal section 32 b that extends radially outward. The sides of the finger rings where they meet along the center of the channel are generally straight. A groove 35 extends around the inner edge of the finger ring 32. The groove 35 forms a track in which the rod 48 travels and forms a path in which a medical device is held, as will be described below. In one embodiment of the invention, each finger ring, e.g. finger ring 32, has two rods 48 a, 48 b that slide within the groove 35 to hold the finger ring in the channel. Although the embodiment of the invention shown uses rods to hold the finger rings in the channel, it will be appreciated that other mechanisms such as a cooperating shape on the top or bottom plate 25 a, 25 b and the inner surface of the finger ring channel could also be used to keep the finger rings within the channel.
The flared section 32 b of the finger ring also includes a hole 32 c into which a user can insert their finger. A top half 32 d of the finger ring has a similar shape to the bottom half such that the two halves can be fitted together to complete the finger ring 32.
Each finger ring 30, 32 also includes a notch 56 that is used to secure the position of the finger ring in the channel. The lock 38 has a post 52 that is fitted within a slot 54 on the top plate 25 a of the body 22. The lock 38 is moveable within the slot 54 such that the post 52 selectively engages the slot 56 on the finger rings 30, 32. If the post 52 is engaged in the notch 56, the position of the finger ring is fixed in the channel. By moving the lock 38 to one side or the other in the slot 54, either finger ring can be secured.
To assemble the advancer/retractor, the medical device is threaded through the holes in the rods 48 a, 48 b and has one end secured in the outside rod using an adhesive, soldering, welding, crimping, etc. The straight portion 32 a of the finger ring is positioned such that the rods 48 a, 48 b align with the groove 35 on either side of the straight portion 32 a of the finger ring. The top half 32 d of the finger ring is then secured to the bottom half with an adhesive or with ultrasonic welding or the like to complete the finger ring. With the rods extending into the channel of the finger ring, the finger ring is held in place in the body 22 of the advancer retractor. The finger ring 30 is generally a mirror image of the finger ring 32 and is assembled in the same way.
As indicated above, each of the ports 24, 26 allow devices such as an electrosurgical generator to be connected to the corresponding medical device moved by the finger ring. In the case of an electrical snare, the port must allow the rods in which the snare is located to be contacted electrically. In the case of a hypo tube, the port should allow a fluid to be pushed into or out of the rod in which the hypo tube is located. The hypo tube should have one or more holes at its proximal end to allow the fluid to enter the lumen of the hypo tube.
While the preferred embodiment of the invention has been illustrated and described, it will be appreciated that various changes can be made therein without departing from the spirit and scope of the invention. For example, the advancer/retractor is not limited to use with hypo tubes or wire snares. Any medical device that is sufficiently flexible to be moved by the finger ring could be used. It is therefore intended that the scope of the invention be determined from the following claims and equivalents thereof.
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|Citing Patent||Filing date||Publication date||Applicant||Title|
|US8540738||May 14, 2012||Sep 24, 2013||Cavanaugh Medical Devices, Llc||Method and apparatus for delivery of a ligating suture|
|US8728057 *||Jun 4, 2010||May 20, 2014||Adapta Medical, Inc.||Devices and methods for catheter advancement|
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|U.S. Classification||606/1, 606/46|
|International Classification||A61B18/18, A61B10/06, A61B17/00, A61B17/32, A61B1/005, A61B17/28, A61B17/34, A61B10/00|
|Cooperative Classification||A61B2017/00353, A61B17/3478, A61B17/2909, A61B2017/2911, A61B17/32056, A61B2017/00371, A61B10/06, A61B1/0052|
|European Classification||A61B1/005B4, A61B17/29H|
|Aug 28, 2007||CC||Certificate of correction|
|Aug 24, 2010||FPAY||Fee payment|
Year of fee payment: 4
|Aug 13, 2014||FPAY||Fee payment|
Year of fee payment: 8